Derivative Tax : investor or trader ?

May i request you to clarify my doubts. 1) Whether govt. servant / officer can invest in derivatives ( daily 1 or 2 trades in future ) if it's consider as a business income ? means govt. servant can earned business income while doing his service ? 2) if I am an Investor as well as trader, then similar depriciations also applicable for STCG also ? like computer, furniture, vechile, repairs etc ? 3) can I get rebate of STT from STCG ? what are the eligible deductions ? 4) whether 'clubbing of income' is applicable for me if i give the loan amount to my relatives for same trading & investment ( non earned family member) ? is it necessary to reflect it through my bank a/c ? means can I give it by cash ? 5) How to save my income tax ? if my profit in derivative transaction is Rs. 3 lakhs if I trade daily 1 or 2 transaction ( shall I consider STCG or business income ?, what to purchase for getting depriciations benifits ?
Regards !
suresh9928@**********

Suppose u make a profit of 50k in equity trading and made a loss of 50k in futures.What will be the tax for the current year?

Can anybody help me

Dear Ashish G , thank you very much ! for your great Reply. You have really understand my mind 7 given the reply to the points . Thanks again ! regards ! ---- Suresh